Thank you for your help!
This didn’t help unfortunately, the white area was still there under the images 🙁
I added .masonry-brick class to the code above as well, because it has affected the search ‘no result’ page too.
Then I added
.masonry-post.masonry-brick .entry-summary {
display: none;
}as well and also this code:
.post-image a, .post-image a img, .post-image {line-height:0!important;}
don’t know how correct it is, but this helped at the end, no more white areas 😉
anyway, I’m thinking to make the whole background white, so …